/*
 * FileName: SpringContextUtil.java
 *
 */
package com.mrc.core.utils;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * <p>
 * Description: 
 * </p>
 *
 * @author Mrc
 * @version 4.1

 * <p>
 * History: 
 *
 * Date                     Author         Version     Description
 * ---------------------------------------------------------------------------------
 * 2016-12-22 下午12:00:36          Mrc        4.1         To create
 * </p>
 *
 * @since 
 * @see     
 */
public class SpringContextUtil implements ApplicationContextAware {
    private static ApplicationContext applicationContext; //Spring应用上下文环境  

    /** 
    * 实现ApplicationContextAware接口的回调方法，设置上下文环境    
    * @param applicationContext 
    * @throws BeansException 
    */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextUtil.applicationContext = applicationContext;
    }

    /** 
    * @return ApplicationContext 
    */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /** 
    * 获取对象    
    * @param name 
    * @return Object 一个以所给名字注册的bean的实例 
    * @throws BeansException 
    */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }

    /** 
    * 获取类型为requiredType的对象 
    * 如果bean不能被类型转换，相应的异常将会被抛出（BeanNotOfRequiredTypeException） 
    * @param name       bean注册名 
    * @param requiredType 返回对象类型 
    * @return Object 返回requiredType类型对象 
    * @throws BeansException 
    */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static Object getBean(String name, Class requiredType) throws BeansException {
        return applicationContext.getBean(name, requiredType);
    }

    /** 
    * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true  
    * @param name 
    * @return boolean 
    */
    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    /** 
    * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 
    * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）    
    * @param name 
    * @return boolean 
    * @throws NoSuchBeanDefinitionException 
    */
    public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.isSingleton(name);
    }

    /** 
    * @param name 
    * @return Class 注册对象的类型 
    * @throws NoSuchBeanDefinitionException 
    */
    @SuppressWarnings("rawtypes")
    public static Class getType(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getType(name);
    }

    /** 
    * 如果给定的bean名字在bean定义中有别名，则返回这些别名    
    * @param name 
    * @return 
    * @throws NoSuchBeanDefinitionException 
    */
    public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
        return applicationContext.getAliases(name);
    }
}
